Bankruptcy for US Li ion battery maker US lithium iron phosphate battery maker A123 Systems has filed for bankruptcy. Meanwhile, it has arranged to sell its automotive batteries business to technology giant Johnson Controls.

Why Tesla Motors Is Betting On The Model S Elon Musk's Tesla Motors isn't just an electric car company - it's perhaps the greatest test of Silicon Valley's innovation model. And now is do-or-die time, when everything is riding on a new $50,000 sedan.